Development
The easiest path to work on the RJSF javascript is to symlink the {path to library directory}/drupal-rjsf--editor/dist directory directly to the {path to modules directory}/contrib/rjsf/dist directory. Once that is done move into {path to modules directory}/contrib/rjsf from there yarn build:all which will build the editor and all fields/widgets. The submodules also provide their own yarn build and yarn build:dev commands which can be used to rebuild just their js without having to rebuild everything.
mkdir {path to library directory}/drupal-rjsf--editorcd {path to library directory}/drupal-rjsf--editorln -s ../../modules/contrib/rjsf/dist/ distcd ../../modules/contrib/rjsfyarn build:all